Unspeakable Horror

At the beginning of each player's upkeep, put a horror counter on Unspeakable horror, then that player sacrifices an untapped creature for each horror counter on Unspeakable Horror. For each creature that dies this way, that player loses 1 life and discards a card. If no creatures die this way, sacrifice Unspeakable Horror.
"Yet another reminder that our world is deeply flawed to its very core. This reality must be erased."
-Melissa, Grand-dream Seer.